20120278500 has 576 divisors, whose sum is σ = 77195349504. Its totient is φ = 4478976000.

The previous prime is 20120278487. The next prime is 20120278501. The reversal of 20120278500 is 587202102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20120278501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 34870212 + ... + 34870788.

It is an arithmetic number, because the mean of its divisors is an integer number (134019704).

Almost surely, 2^20120278500 is an apocalyptic number.

20120278500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20120278500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38597674752).

20120278500 is an abundant number, since it is smaller than the sum of its proper divisors (57075071004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20120278500 is a wasteful number, since it uses less digits than its factorization.

20120278500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The spelling of 20120278500 in words is "twenty billion, one hundred twenty million, two hundred seventy-eight thousand, five hundred".